body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f4f4;
    text-align: center;
}

form {
    display: inline-block;
    padding: 20px;
    background: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    border-radius: 10px;
}

input, button {
    display: block;
    margin: 10px 0;
    padding: 10px;
    width: 100%;
    border: 1px solid #ccc;
    border-radius: 5px;
}

.tabs {
    display: flex;
    justify-content: center;
    background: #f4f4f4;
    border-bottom: 2px solid #ccc;
}

.tab {
    padding: 10px 20px;
    cursor: pointer;
    background: #e0e0e0;
    margin-right: 5px;
}

.tab.active {
    background: #fff;
    font-weight: bold;
    border-top: 2px solid #000;
}